How to use Default parameters

Question

Hello,
How do I use default parameters from ODP.NET. I have a proc in Oracle that shows Default? = Y when I do Describe in PL/SQL Developer. Therefore, I don't want to pass this parameter at all via ODP.NET/C# call. If I omit this parameter, I get the dreaded "Invalid number or types of parameters" error.
Thanks for your help,
Evgueni

Answer 1

Hi,
You'll just want to set OracleCommand::BindByName=true. Here's an example, hope it helps.
Greg
create or replace function showparams(p1 varchar2, p2 varchar2 default 'foo',
           p3 varchar2, p4 varchar2 default 'bar') return varchar2
is
retval varchar2(4000);
begin
retval := 'p1 = '|| p1;
retval := retval || ',p2 = ' || p2;
retval := retval || ',p3 = ' || p3;
retval := retval || ',p4 = ' || p4;
return retval;
end;
using System;
using System.Data;
using Oracle.DataAccess.Client;
class testdefault
    static void Main(string[] args)
        using (OracleConnection con = new OracleConnection("data source=orcl;user id=scott;password=tiger"))
            con.Open();
            using (OracleCommand cmd = new OracleCommand("showparams", con))
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.BindByName = true;
                cmd.Parameters.Add( new OracleParameter("retval", OracleDbType.Varchar2,4000));
                cmd.Parameters["retval"].Direction = ParameterDirection.ReturnValue;
                cmd.Parameters.Add("p1", "firstval");
                cmd.Parameters.Add("p3", "secondval");
                cmd.ExecuteNonQuery();
                Console.WriteLine(cmd.Parameters["retval"].Value.ToString());
}OUTPUT
=========
p1 = firstval,p2 = foo,p3 = secondval,p4 = bar
Press any key to continue . . .